// SPDX-License-Identifier: GPL-2.0-only /* * OMAP DMAengine support */ #include <linux/cpu_pm.h> #include <linux/delay.h> #include <linux/dmaengine.h> #include <linux/dma-mapping.h> #include <linux/dmapool.h> #include <linux/err.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/list.h> #include <linux/module.h> #include <linux/omap-dma.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/of.h> #include <linux/of_dma.h> #include "../virt-dma.h" #define OMAP_SDMA_REQUESTS … #define OMAP_SDMA_CHANNELS … struct omap_dma_config { … }; struct omap_dma_context { … }; struct omap_dmadev { … }; struct omap_chan { … }; #define DESC_NXT_SV_REFRESH … #define DESC_NXT_SV_REUSE … #define DESC_NXT_DV_REFRESH … #define DESC_NXT_DV_REUSE … #define DESC_NTYPE_TYPE2 … /* Type 2 descriptor with Source or Destination address update */ struct omap_type2_desc { … } __packed; struct omap_sg { … }; struct omap_desc { … }; enum { … }; static const unsigned es_bytes[] = …; static bool omap_dma_filter_fn(struct dma_chan *chan, void *param); static struct of_dma_filter_info omap_dma_info = …; static inline struct omap_dmadev *to_omap_dma_dev(struct dma_device *d) { … } static inline struct omap_chan *to_omap_dma_chan(struct dma_chan *c) { … } static inline struct omap_desc *to_omap_dma_desc(struct dma_async_tx_descriptor *t) { … } static void omap_dma_desc_free(struct virt_dma_desc *vd) { … } static void omap_dma_fill_type2_desc(struct omap_desc *d, int idx, enum dma_transfer_direction dir, bool last) { … } static void omap_dma_write(uint32_t val, unsigned type, void __iomem *addr) { … } static unsigned omap_dma_read(unsigned type, void __iomem *addr) { … } static void omap_dma_glbl_write(struct omap_dmadev *od, unsigned reg, unsigned val) { … } static unsigned omap_dma_glbl_read(struct omap_dmadev *od, unsigned reg) { … } static void omap_dma_chan_write(struct omap_chan *c, unsigned reg, unsigned val) { … } static unsigned omap_dma_chan_read(struct omap_chan *c, unsigned reg) { … } static void omap_dma_clear_csr(struct omap_chan *c) { … } static unsigned omap_dma_get_csr(struct omap_chan *c) { … } static void omap_dma_clear_lch(struct omap_dmadev *od, int lch) { … } static void omap_dma_assign(struct omap_dmadev *od, struct omap_chan *c, unsigned lch) { … } static void omap_dma_start(struct omap_chan *c, struct omap_desc *d) { … } static void omap_dma_drain_chan(struct omap_chan *c) { … } static int omap_dma_stop(struct omap_chan *c) { … } static void omap_dma_start_sg(struct omap_chan *c, struct omap_desc *d) { … } static void omap_dma_start_desc(struct omap_chan *c) { … } static void omap_dma_callback(int ch, u16 status, void *data) { … } static irqreturn_t omap_dma_irq(int irq, void *devid) { … } static int omap_dma_get_lch(struct omap_dmadev *od, int *lch) { … } static void omap_dma_put_lch(struct omap_dmadev *od, int lch) { … } static inline bool omap_dma_legacy(struct omap_dmadev *od) { … } static int omap_dma_alloc_chan_resources(struct dma_chan *chan) { … } static void omap_dma_free_chan_resources(struct dma_chan *chan) { … } static size_t omap_dma_sg_size(struct omap_sg *sg) { … } static size_t omap_dma_desc_size(struct omap_desc *d) { … } static size_t omap_dma_desc_size_pos(struct omap_desc *d, dma_addr_t addr) { … } /* * OMAP 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is * read before the DMA controller finished disabling the channel. */ static uint32_t omap_dma_chan_read_3_3(struct omap_chan *c, unsigned reg) { … } static dma_addr_t omap_dma_get_src_pos(struct omap_chan *c) { … } static dma_addr_t omap_dma_get_dst_pos(struct omap_chan *c) { … } static enum dma_status omap_dma_tx_status(struct dma_chan *chan, dma_cookie_t cookie, struct dma_tx_state *txstate) { … } static void omap_dma_issue_pending(struct dma_chan *chan) { … } static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg( struct dma_chan *chan, struct scatterlist *sgl, unsigned sglen, enum dma_transfer_direction dir, unsigned long tx_flags, void *context) { … } static struct dma_async_tx_descriptor *omap_dma_prep_dma_cyclic( struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, size_t period_len, enum dma_transfer_direction dir, unsigned long flags) { … } static struct dma_async_tx_descriptor *omap_dma_prep_dma_memcpy( struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, size_t len, unsigned long tx_flags) { … } static struct dma_async_tx_descriptor *omap_dma_prep_dma_interleaved( struct dma_chan *chan, struct dma_interleaved_template *xt, unsigned long flags) { … } static int omap_dma_slave_config(struct dma_chan *chan, struct dma_slave_config *cfg) { … } static int omap_dma_terminate_all(struct dma_chan *chan) { … } static void omap_dma_synchronize(struct dma_chan *chan) { … } static int omap_dma_pause(struct dma_chan *chan) { … } static int omap_dma_resume(struct dma_chan *chan) { … } static int omap_dma_chan_init(struct omap_dmadev *od) { … } static void omap_dma_free(struct omap_dmadev *od) { … } /* Currently used by omap2 & 3 to block deeper SoC idle states */ static bool omap_dma_busy(struct omap_dmadev *od) { … } /* Currently only used for omap2. For omap1, also a check for lcd_dma is needed */ static int omap_dma_busy_notifier(struct notifier_block *nb, unsigned long cmd, void *v) { … } /* * We are using IRQENABLE_L1, and legacy DMA code was using IRQENABLE_L0. * As the DSP may be using IRQENABLE_L2 and L3, let's not touch those for * now. Context save seems to be only currently needed on omap3. */ static void omap_dma_context_save(struct omap_dmadev *od) { … } static void omap_dma_context_restore(struct omap_dmadev *od) { … } /* Currently only used for omap3 */ static int omap_dma_context_notifier(struct notifier_block *nb, unsigned long cmd, void *v) { … } static void omap_dma_init_gcr(struct omap_dmadev *od, int arb_rate, int max_fifo_depth, int tparams) { … } #define OMAP_DMA_BUSWIDTHS … /* * No flags currently set for default configuration as omap1 is still * using platform data. */ static const struct omap_dma_config default_cfg; static int omap_dma_probe(struct platform_device *pdev) { … } static void omap_dma_remove(struct platform_device *pdev) { … } static const struct omap_dma_config omap2420_data = …; static const struct omap_dma_config omap2430_data = …; static const struct omap_dma_config omap3430_data = …; static const struct omap_dma_config omap3630_data = …; static const struct omap_dma_config omap4_data = …; static const struct of_device_id omap_dma_match[] = …; MODULE_DEVICE_TABLE(of, omap_dma_match); static struct platform_driver omap_dma_driver = …; static bool omap_dma_filter_fn(struct dma_chan *chan, void *param) { … } static int omap_dma_init(void) { … } subsys_initcall(omap_dma_init); static void __exit omap_dma_exit(void) { … } module_exit(omap_dma_exit); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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